27 March 2012 Inter-crosslinking network gels having both shape memory and high ductility
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Abstract
Medical treatment for injuries should be easy and quick in many accidents. Plasters or bandages are frequently used to wrap and fix injured parts. If plasters or bandages have additional smart functions, such as cooling, removability and repeatability, they will be much more useful and effective. Here we propose innovative biocompatible materials, that is, nontoxic high-strength shape-memory gels as novel smart medical materials. These smart gels were prepared from two monomers (DMAAm and SA), a polymer (HPC), and an inter-crosslinking agent (Karenz-MOI). In the synthesis of the gels, 1) a shape-memory copolymer network is made from the DMAAm and the SA, and 2) the copolymer and the HPC are crosslinked by the Karenz-MOI. Thus the crosslinking points are connected only between the different polymers. This is our original technique of developing a new network structure of gels, named Inter-Crosslinking Network (ICN). The ICN gels achieve high ductility, going up to 700% strain in tensile tests, while the ICN gels contain about 44% water. Moreover the SA has temperature dependence due to its crystallization properties; thus the ICN gels obtain shape memory properties and are named ICN-SMG. While the Young's modulus of the ICN-SMG is large below their crystallization temperature and the gels behave like plastic materials, the modulus becomes smaller above the temperature and the gels turn back to their original shape.
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Yoshitaka Amano, Yoshitaka Amano, Ruri Hidema, Ruri Hidema, Hidemitsu Furukawa, Hidemitsu Furukawa, } "Inter-crosslinking network gels having both shape memory and high ductility", Proc. SPIE 8341, Active and Passive Smart Structures and Integrated Systems 2012, 83412B (27 March 2012); doi: 10.1117/12.915090; https://doi.org/10.1117/12.915090
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